alleryWhy is a synodic month longer than a sidereal month?
AThe Moon speeds up
BEarth also orbits the Sun
CThe Sun moves west
DThe stars move closer
Answer & Solution
Correct answer: B. Earth also orbits the Sun
1. The Earth-Moon pair orbits the Sun in the same direction as the Moon orbits Earth.
2. After one sidereal month the Moon must go a little further to line up with the Sun again.
3. That is why the synodic month is longer, by about 2.2 days.
_Source: Wikipedia, Month, Types of months in astronomy_
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